Issue 12, 1986

Absorptiometric and fluorimetric study of solvent dependence and prototropism of benzimidazole homologues

Abstract

Electronic absorption and fluorescence spectra of benzimidazole and six of its derivatives in different solvents and at various pH values have been studied. The dual fluorescence observed in dilute acid solutions and the similarity of the fluorescence excitation spectra to the absorption spectra indicate the existence of several excited states of benzimidazoles. The emitting transition of neutral benzimidazoles is πâ†�π*; in the case of the monocations the short-wavelength fluorescence band is from the πâ†�π* transition and the long-wavelength band arises from charge transfer. The pKa values for various prototropic reactions in aqueous solutions in the S0 and S1 states have been calculated, and the proton-induced fluorescence quenching of the monocations is discussed.

Article information

Article type
Paper

J. Chem. Soc., Perkin Trans. 2, 1986, 1917-1925

Absorptiometric and fluorimetric study of solvent dependence and prototropism of benzimidazole homologues

M. Krishnamurthy, P. Phaniraj and S. K. Dogra, J. Chem. Soc., Perkin Trans. 2, 1986, 1917 DOI: 10.1039/P29860001917

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